asp.net 發送email

Email.aspx：

Email.aspx.cs：

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Web.Mail;
using System.IO;

namespace test
{
///

/// email 的摘要說明。
///

public class email : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.TextBox tbSubject;
protected System.Web.UI.WebControls.TextBox tbBody;
protected System.Web.UI.HtmlControls.HtmlInputFile upfile;
protected System.Web.UI.WebControls.DropDownList DropDownList1;
protected System.Web.UI.WebControls.Button Button2;
protected System.Web.UI.WebControls.Button Button3;
protected System.Web.UI.WebControls.TextBox tbTo;

private void Page_Load(object sender, System.EventArgs e)
{
if (!this.IsPostBack)
{
}
}

#region Web Form設計器產生的程式碼
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 該調用是 ASP.NET Web Form設計器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

///

/// 設計器支援所需的方法 - 不要使用代碼編輯器修改
/// 此方法的內容。
///

private void InitializeComponent()
{
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Button2.Click += new System.EventHandler(this.Button2_Click);
this.Button3.Click += new System.EventHandler(this.Button3_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void Button1_Click(object sender, System.EventArgs e)
{
MailMessage myMail = new MailMessage();
myMail.Subject = this.tbSubject.Text.Trim();
myMail.From = "smallfools@sina.com";
myMail.To = this.tbTo.Text.Trim();
myMail.Body = this.tbBody.Text;
myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate",1);
myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", " smallfools");
myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "****");

if (this.DropDownList1.Items.Count>0)
{
for (int i=0;i<this.DropDownList1.Items.Count;i++)
{
MailAttachment myAttachment = new System.Web.Mail.MailAttachment(Server.MapPath(this.DropDownList1.Items[i].Value));
myMail.Attachments.Add(myAttachment);
}

}

SmtpMail.SmtpServer = "smtp.sina.com.cn";
SmtpMail.Send(myMail);

if (this.DropDownList1.Items.Count>0)
{
for (int i=0;i<this.DropDownList1.Items.Count;i++)
{
FileInfo myFile = new FileInfo(Server.MapPath(this.DropDownList1.Items[i].Value));
myFile.Delete();
}
}

Page.RegisterClientScriptBlock("ok","");
}

private void Button2_Click(object sender, System.EventArgs e)
{
if (this.upfile.PostedFile.ContentLength != 0)
{
string clientFileName = this.upfile.PostedFile.FileName;
string[] strTemp = clientFileName.Split('.');
string upFileExp = strTemp[strTemp.Length-1].ToString();
string ServerFileName = DateTime.Now.ToString("yyyyMMddhhmmss")+"."+upFileExp;
this.upfile.PostedFile.SaveAs(Server.MapPath(ServerFileName));
this.DropDownList1.Items.Add(new ListItem(clientFileName,ServerFileName));

if (this.DropDownList1.Items.Count>0)
{
this.Button3.Enabled = true;
}
else
{
this.Button3.Enabled = false;
}
}
}

private void Button3_Click(object sender, System.EventArgs e)
{
FileInfo myFile = new FileInfo(Server.MapPath(this.DropDownList1.SelectedValue));
myFile.Delete();

this.DropDownList1.Items.Remove(this.DropDownList1.Items[this.DropDownList1.SelectedIndex]);

if (this.DropDownList1.Items.Count>0)
{
this.Button3.Enabled = true;
}
else
{
this.Button3.Enabled = false;
}
}
}
}